National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Current conditions at

Rapid City, Rapid City Regional Airport (KRAP)

Lat: 44.05°NLon: 103.05°WElev: 3202ft.

Fog/Mist

61°F

16°C

Humidity 100%
Wind Speed SE 3 mph
Barometer 30.10 in (1017.6 mb)
Dewpoint 61°F (16°C)
Visibility 1.75 mi
Last update 18 Sep 1:52 am MDT
Extended Forecast for

New Underwood SD

  • Overnight

    Overnight: A 50 percent chance of showers, mainly before 3am. Patchy fog. Otherwise, cloudy, with a steady temperature around 60. North wind 6 to 8 mph.

    Low: 60 °F

    Chance
    Showers and
    Patchy Fog

  • Friday

    Friday: Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 75. North wind 6 to 9 mph becoming northeast in the afternoon. Winds could gust as high as 18 mph.

    High: 75 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: A 30 percent chance of showers after midnight. Increasing clouds, with a low around 54. East wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers likely, mainly before noon. Cloudy, with a high near 68. East wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    High: 68 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers. Low around 52. East wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.

    Low: 52 °F

    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 9am, then showers between 9am and 3pm, then showers and possibly a thunderstorm after 3pm. High near 62. East wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.

    High: 62 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before midnight. Low around 49. Chance of precipitation is 90%.

    Low: 49 °F

    Showers then
    Chance
    Showers

  • Monday

    Monday: A chance of showers, mainly before noon. Mostly cloudy, with a high near 66.

    High: 66 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 50 percent chance of showers, mainly before 3am. Patchy fog. Otherwise, cloudy, with a steady temperature around 60. North wind 6 to 8 mph.
Friday
Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 75. North wind 6 to 9 mph becoming northeast in the afternoon. Winds could gust as high as 18 mph.
Friday Night
A 30 percent chance of showers after midnight. Increasing clouds, with a low around 54. East wind 6 to 10 mph, with gusts as high as 18 mph.
Saturday
Showers likely, mainly before noon. Cloudy, with a high near 68. East wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Saturday Night
Showers. Low around 52. East wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.
Sunday
Showers and possibly a thunderstorm before 9am, then showers between 9am and 3pm, then showers and possibly a thunderstorm after 3pm. High near 62. East wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.
Sunday Night
Showers, mainly before midnight. Low around 49. Chance of precipitation is 90%.
Monday
A chance of showers, mainly before noon. Mostly cloudy, with a high near 66.
Monday Night
Mostly cloudy, with a low around 49.
Tuesday
Partly sunny, with a high near 74. Breezy.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 52. Breezy.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 51.
Thursday
Sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
New Underwood SD
 44.09°N 102.82°W (Elev. 2894 ft)
Last Update:
1:31 am MDT Sep 18, 2026
Forecast Valid:
1am MDT Sep 18, 2026-6pm MDT Sep 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation